Yes, yes, it's that time of the year again - a new Fiona Apple album confirmed (which makes anything that happens between now and spring 2011 irrelevant and annoying), MorphOS 2.6 released (will be the next news item), and, of course, a new Ubuntu release showcasing the best of the best that the Free software world has to offer in the desktop world.

If you had read the source you yourself linked you would have noticed that lossy PNG is a one-man research project. The word "research" reads right there inside brackets. It is not in any way part of the standard nor is it supported anywhere. A standard PNG file is always lossless and pixel-perfect.